Supplemental Cash Flow Information - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 730,957	$ 144,232	$ 130,521
Restricted cash	105,684	40,425	25,531
Cash, cash equivalents and restricted cash	$ 836,641	$ 184,657	$ 156,052	$ 139,846